Experimentally Verified, Fast Analytic, and Numerical Design of Superconducting Resonators in Flip-Chip Architectures

Li, Hang-Xi; Shiri, Daryoush; Kosen, Sandoko; Rommel, Marcus; Chayanun, Lert; Nylander, Andreas; Rehammar, Robert; Tancredi, Giovanna; Caputo, Marco; Grigoras, Kestutis; Grönberg, Leif; Govenius, Joonas; Bylander, Jonas

doi:10.1109/tqe.2023.3302371

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…2 In contrast to the metal-facing design, we carried out additional etching of the aluminum film facing the resonator on the bottom chip with a specific length. This approach results in the resonator frequency displaying opposite responses to changes in inter-chip spacings between metal-facing and dielectric-facing configurations [23]. By partially removing the metal layer facing the resonator, we can effectively mitigate the impact of chip spacing variations on frequency, leading to a frequency robust design.…”

Section: Resonator Design and Simulationmentioning

confidence: 99%

“…In this work, we present and evaluate a design-side approach aimed at mitigating the impact of the inter-chip spacing variability on the frequency of resonators in flip-chip configurations, as concurrently proposed in theory by Li et al [23]. Our design includes a robust resonator that can withstand a substantial range of inter-chip spacing fluctuations.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Resonator Frequency Stability in Flip-Chip Architectures: A Novel Experimental Design Approach

An,

Li,

Wang

et al. 2024

Preprint

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In multi-qubit superconducting systems utilizing flip-chip technology, achieving high accuracy in resonator frequencies is of paramount importance, particularly when multiple resonators share a common Purcell filter with restricted bandwidth. Nevertheless, variations in inter-chip spacing can considerably influence these frequencies. To tackle this issue, we present and experimentally validate the effectiveness of a resonator design. In our design, we etch portions of the metal on the bottom chip that faces the resonator structure on the top chip. This enhanced design substantially improves frequency stability by a factor of over 3.5 compared to the non-optimized design, as evaluated by the root mean square error of a linear fitting of the observed frequency distribution, which is intended to be linear. This advancement is crucial for successful scale-up and achievement of high-fidelity quantum operations.

show abstract

Section: Resonator Design and Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing Resonator Frequency Stability in Flip-Chip Architectures: A Novel Experimental Design Approach

An,

Li,

Wang

et al. 2024

Preprint

View full text Add to dashboard Cite

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Broadband bandpass Purcell filter for circuit quantum electrodynamics

Yan,

Wu,

Lingenfelter

et al. 2023

Applied Physics Letters

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In circuit quantum electrodynamics, qubits are typically measured using dispersively coupled readout resonators. Coupling between each readout resonator and its electrical environment, however, reduces the qubit lifetime via the Purcell effect. Inserting a Purcell filter counters this effect while maintaining high readout fidelity but reduces measurement bandwidth and, thus, limits multiplexing readout capacity. In this Letter, we develop and implement a multi-stage bandpass Purcell filter that yields better qubit protection while simultaneously increasing measurement bandwidth and multiplexed capacity. We report on the experimental performance of our transmission-line-based implementation of this approach, a flexible design that can easily be integrated with current scaled-up, long coherence time superconducting quantum processors.

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Characterization of broadband Purcell filters with compact footprint for fast multiplexed superconducting qubit readout

Park,

Choi,

Kim

et al. 2024

Applied Physics Letters

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Engineering the admittance of external environments connected to superconducting qubits is essential, as increasing the measurement speed introduces spontaneous emission loss to superconducting qubits, known as Purcell loss. Here, we report a broadband Purcell filter within a small footprint, which effectively suppresses Purcell loss without losing the fast measurement speed. We characterize the filter's frequency response at 4.3 K and also estimate Purcell loss suppression by finite-element-method simulations of superconducting planar circuit layouts with the proposed filter design. The filter is fabricated with 200 nm-thick niobium films and shows the measured bandwidth over 790 MHz within 0.29 mm2 of compact size owing to densely packed spiral resonators. The estimated lifetime enhancement indicates the effective protection of the qubit from Purcell loss. The presented filter design is expected to be easily integrated on existing superconducting quantum circuits for fast and multiplexed readout without occupying large footprint.

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Experimentally Verified, Fast Analytic, and Numerical Design of Superconducting Resonators in Flip-Chip Architectures

Cited by 4 publications

References 33 publications

Optimizing Resonator Frequency Stability in Flip-Chip Architectures: A Novel Experimental Design Approach

Optimizing Resonator Frequency Stability in Flip-Chip Architectures: A Novel Experimental Design Approach

Broadband bandpass Purcell filter for circuit quantum electrodynamics

Characterization of broadband Purcell filters with compact footprint for fast multiplexed superconducting qubit readout

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